зеркало из https://github.com/mozilla/gecko-dev.git
89 строки
2.4 KiB
C++
89 строки
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <windows.h>
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#include "base/process_util.h"
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#include "CrossProcessSemaphore.h"
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#include "nsDebug.h"
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#include "nsISupportsImpl.h"
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#include "ProtocolUtils.h"
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using base::GetCurrentProcessHandle;
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using base::ProcessHandle;
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namespace mozilla {
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/* static */ CrossProcessSemaphore*
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CrossProcessSemaphore::Create(const char*, uint32_t aInitialValue)
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{
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// We explicitly share this using DuplicateHandle, we do -not- want this to
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// be inherited by child processes by default! So no security attributes are
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// given.
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HANDLE semaphore = ::CreateSemaphoreA(nullptr, aInitialValue, 0x7fffffff, nullptr);
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if (!semaphore) {
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return nullptr;
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}
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return new CrossProcessSemaphore(semaphore);
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}
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/* static */ CrossProcessSemaphore*
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CrossProcessSemaphore::Create(CrossProcessSemaphoreHandle aHandle)
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{
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DWORD flags;
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if (!::GetHandleInformation(aHandle, &flags)) {
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return nullptr;
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}
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return new CrossProcessSemaphore(aHandle);
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}
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CrossProcessSemaphore::CrossProcessSemaphore(HANDLE aSemaphore)
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: mSemaphore(aSemaphore)
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{
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MOZ_COUNT_CTOR(CrossProcessSemaphore);
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}
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CrossProcessSemaphore::~CrossProcessSemaphore()
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{
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MOZ_ASSERT(mSemaphore, "Improper construction of semaphore or double free.");
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::CloseHandle(mSemaphore);
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MOZ_COUNT_DTOR(CrossProcessSemaphore);
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}
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bool
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CrossProcessSemaphore::Wait(const Maybe<TimeDuration>& aWaitTime)
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{
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MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
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HRESULT hr = ::WaitForSingleObject(mSemaphore, aWaitTime.isSome() ?
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aWaitTime->ToMilliseconds() :
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INFINITE);
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return hr == WAIT_OBJECT_0;
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}
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void
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CrossProcessSemaphore::Signal()
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{
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MOZ_ASSERT(mSemaphore, "Improper construction of semaphore.");
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::ReleaseSemaphore(mSemaphore, 1, nullptr);
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}
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CrossProcessSemaphoreHandle
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CrossProcessSemaphore::ShareToProcess(base::ProcessId aTargetPid)
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{
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HANDLE newHandle;
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bool succeeded = ipc::DuplicateHandle(mSemaphore, aTargetPid, &newHandle,
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0, DUPLICATE_SAME_ACCESS);
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if (!succeeded) {
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return nullptr;
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}
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return newHandle;
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}
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}
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